I recently bought a system from a guy on eBay which was advertised as titanium but I am not convinced that it is. I was primarily interested in the Termi end can only as it turns out the downpipes are for a testeretta engine not the desmoquattro, but I was going to sell the downpipes on. Googling reveals that the only real world way to tell the difference between Ti and SS is by applying a grinder to see if it sparks white (Ti) or yellow (steel), but I can't do that without damaging it and I can't do that if I want to return it for a refund (the buyer is an utter tosser so there is little point in asking him if he agrees to me doing that). Applying a magnet is a bit hit and miss because some SS alloys are non-magnetic. The downpipes I was sold are either non or only very weakly magnetic but SS parts I have fitted to other bikes and hanging around my workshop are all magnetic to some extent, so this is not definitive. I have googled the part numbers but this only throws up links to eBay ads for OE S4R downpipes, which obviously leans in favour of the part I was sold being made from SS. This guy is an absolute a*se so if it isn't Ti, saying "it looks like steel to me" isn't going to cut it with him (or Paypal, if I need to make a claim). The part numbers are: 572 1 142 1C DUCATI E3 ZDM E10 41R 0358018 (or maybe L41R 0358016 as the "L" might be a "4" and the final "8" might be a "6"). Please see pics (to follow). Thanks.